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Plant Science Today (PST)

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The effect of potassium fertilizer and planting dates on the growth and production of maize (Zea mays L.)

DOI
https://doi.org/10.14719/pst.9827
Submitted
4 June 2025
Published
22-09-2025

Abstract

An agricultural field study was conducted in Ramadi City, located in the Western region of Iraq, during the fall season of 2023, with the objective of examining the effect of three planting dates.  viz 25 March, 5 and 15 April, and three levels of potassium fertilizer, including 100, 150 and 200 kg K2O per hectare, on maize, variety Buhuth 106. Variations in planting dates exerted a notable impact on traits, including plant height, leaf area, ear length, number of ears per plant, weight of 300 grain total grain yield. The planting date of 25 March gave the highest rate of the studied traits, reaching 202.00 cm, 3990 cm2, 15.138 cm, 1.824, 73.82 g and 4.372 tons. ha-1 respectively. Significant differences were observed between the levels of potassium fertilizer for the same traits above. the potassium fertilizer level of 100 kg K₂O. ha-1 was associated with the highest average values observed across all of the measured traits, which amounted to 187.156 cm, 3490 cm-2, 13.413 cm, 1.752 cm, 71.15 g and 3.301 tons. ha-1 respectively. The combined effect of the experimental variables also demonstrated a clear influence on grain yield, as planting on 25 March combined with the application of 100 kg K₂O per hectare resulted in the highest recorded grain yield of 5.210 tons.

References

  1. 1. Mukhlif FH, Ramadan ASA, Hammody DT, Mousa MO, Shahatha SS. Molecular assessment of genetic divergence among maize genotypes. SABRAO J. Breed. Genet. 2023;55(3):739–48. http://doi.org/10.54910/sabrao2023.55.3.12
  2. 2. Elsahookie MM. Corn, production and improvement. Baghdad: Ministry of Higher Education and Scientific Research, University of Baghdad; 1990.
  3. 3. Directorate of Agricultural Statistics. Production of cotton, yellow corn and potatoes. Baghdad: Central Statistical Organization, Ministry of Planning – Iraq; 2017.
  4. 4. Adrian J. Potassium nutrition in North Great Plains: new insights and perspectives. Potash and Phosphate Institute; 2004.
  5. 5. Marschner H. Mineral nutrition of higher plants. 2nd ed. London: Academic Press; 1995.
  6. 6. Barzaq J. Planting yellow corn in the spring season [Internet]. Iraq-datepalms.net; 2012 [cited 2025 Jun 4]. Available from: https://www.iraq-datepalms.net
  7. 7. AL-Dulami BHA, AL-Hadethi NDH. Response of maize to potassium fertilizer and boron leaves nutrition. Anbar J Agric Sci. 2015;13(1):213–25.
  8. 8. Elsahookie MM. Shortcut method for estimating plant leaf area in maize. Agron J Crop Sci. 1985;154:157–60.
  9. 9. Al-Kazaali HA, Bahtash FY. Response of corn grain traits to harvesting moisture. Iraqi J Agric Sci. 2017;48:12–17. http://doi.org/10.36103/ijas.v48iSpecial.239
  10. 10. Farhan EA. Effect of foliar application of potassium on growth characters and NPK content of popcorn Zea mays L. var. everta. Iraqi J Desert Stud. 2020;10(2):20–32.
  11. 11. Ngosong CA, Enow ATDVV, Tening MNEOAS. Optimising potassium fertilizer rates for sustainable maize (Zea mays L.) production on the volcanic soils of Buea, Cameroon. Fundam Appl Agric. 2022;7(1):11–20. http://doi.org/10.5455/faa.96971
  12. 12. Liagat W, Akmal M, Ali J. Sowing dates effect on production of high yielding maize varieties. Sarhad J Agric. 2018;34(1):102–13. http://doi.org/10.17582/journal.sja/2018/34.1.102.113
  13. 13. Mukhlif FH, Al Kaisy AMA, Hammody DT, Mousa MO, Shahatha SS. The effect of potassium fertilizer and planting dates on growth, yield and quality of wheat (Triticum aestivum L.). Kirkuk Univ J Agric Sci. 2023;14(3):1–10. http://doi.org/10.58928/ku23.14301
  14. 14. He B, Ji ZSQ, Wei J, Ma W. Effect of different long-term potassium dosages on crop yield and potassium use efficiency in the maize–wheat rotation system. Agronomy. 2022;12:2565. http://doi.org/10.3390/agronomy12102565
  15. 15. Mohammed KAS, Eid MSM, Usman ARA. Enhancing the agronomic performance of potassium fertilizer and potassium-bearing minerals in sandy loam soil by adding humic acids and mycorrhiza. Assiut J Agric Sci. 2024;55(1):236–54. http://doi.org/10.21608/ajas.2023.243994.1303
  16. 16. Joy B, Yuniarti A, Priyanka, Hakim FK, Taufik I, Wibawa RJ, Wahyu GT. Growth and yield of maize by nitrogen and potassium inorganic fertilizers application to Fluventic Eutrudepts. E3S Web Conf. 2023;444:04026. http://doi.org/10.1051/e3sconf/202344404026
  17. 17. Al-Hilfy IHH, Al-Temimi AHM. Response of some synthetic maize cultivars to mineral, organic and bio fertilizer. Iraqi J Agric Sci. 2017;48(7):2763–71.
  18. 18. Regab KH, Jassim WM. The effect of sowing dates on grains yield and components for some crosses corn (Zea mays L.). Tikrit J Agric Sci. 2016;16(1):21–29.
  19. 19. Zhang Q, Li G, Lu WLD. Interactive effects of nitrogen and potassium on grain yield and quality of waxy maize. Plants. 2022;11:2528. http://doi.org/10.3390/plants11192528

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